Unable to run eslint in Next.js - reactjs

I'm trying to set up eslint on my Next.js project. I followed the guide here https://nextjs.org/docs/basic-features/eslint
When I run yarn lint, I receive the error error - ESLint must be installed.
In my "devDependencies" in package.json, I have the following:
"eslint": "^8.0.1",
"eslint-config-next": "11.1.2"
I tried running yarn add --dev eslint, but I still receive the same error after running the lint command.
Edit:
This is an existing project. Was created with yarn create next-app.
Versions for next and react below
"next": "^11.1.2",
"react": "^17.0.2"
Node v14.18.1

ESLint v8 introduced breaking changes that impact compatibility with Next. Downgrading to 7.32.0 seems to work for most people.
The Next team is currently working on adding v8 support.

Related

Type issue in build with sharp in Next.js app

In the image below, I can't yarn build the app.
I'm using Plaiceholder that depends on Sharp.
Everything is working fine, but when I build the app it crashes.
Versions that I'm using:
"react": "17.0.2"
"next": "12.1",
"sharp": "^0.31.0",
"#types/sharp": "^0.31.0",
You're most likely on a TypeScript version that does not support the type modifier on named imports, which has been introduced in TypeScript 4.5.
Make sure you're at least on TypeScript v4.5.
yarn add typescript#4.5.5
Or better yet, try to update to the latest TypeScript version if you can.
yarn add typescript#latest

WARNING: You are currently running a version of TypeScript which is not officially supported by #typescript-eslint/typescript-estree

Hello there I am getting some error in my terminal and its say i need to use 4.4.0 version and my current version is ...
In my project my current typescript version is given below,
"typescript": "^4.4.2",
"typedoc": "^0.21.8",
"react-scripts": "^3.4.4",
"#typescript-eslint/eslint-plugin": "^4.29.3",
"#typescript-eslint/parser": "^4.29.3",
Moreover, when I am trying to run npm run dev commands or npx eslint . is error are showing me which is given below,
=============
WARNING: You are currently running a version of TypeScript which is not
officially supported by #typescript-eslint/typescript-estree.
You may find that it works just fine, or you may not.
SUPPORTED TYPESCRIPT VERSIONS: >=3.3.1 <4.4.0
YOUR TYPESCRIPT VERSION: 4.4.2
Please only submit bug reports when using the officially supported
version.
=============
How can i fix this issue and I have done a lot of research in google but nothing is working. It would be great help for me.
I wouldn't downgrade my Typescript, as you will miss out on newer TS features - I would find a way to update #typescript-eslint/typescript-estree.
You might not have this installed directly and this might be a dependancy of another package, #typescript-eslint/experimental-utils which is dependancy of #typescript-eslint/eslint-plugin for instance, so track down the parent package in your yarn.lock / package.lock file and bump it, as a result it should bump #typescript-eslint/typescript-estree too.
Try using a typescript version between >=3.3.1 <4.4.0.
Here you have the list of typescript versions available.
After changing the version, remove node_modules folder and package-lock.json file. Then execute npm install

Component cannot be used as a JSX component in next.js [duplicate]

Ive been getting these strange type errors on my typescript project for certain packages.
Ex:
'TimeAgo' cannot be used as a JSX component.
Its instance type 'ReactTimeago<keyof IntrinsicElements | ComponentType<{}>>' is not a valid JSX element.
The types returned by 'render()' are incompatible between these types.
Type 'React.ReactNode' is not assignable to type 'import("/home/user/app/node_modules/#types/react-bootstrap-table-next/node_modules/#types/react/index").ReactNode'.
Type '{}' is not assignable to type 'ReactNode'.
I don't get these type errors on my local windows machine but they keep occurring in my linux virtual machine. I've deleted the project many times, cloned my repo and installed packages again in different versions of node and I still get the same type errors.
Checked node 12.18.3, 16.13.1
Here is some quick package json info:
"react-timeago": "^6.2.1",
"react-custom-scrollbars": "^4.2.1",
"react-custom-scrollbars-2": "^4.4.0",
"react": "^17.0.2",
"next": "^12.1.1",
"#types/react-custom-scrollbars": "^4.0.10",
"#types/react-timeago": "^4.1.3",
"#types/react": "^17.0.44",
"typescript": "^4.3.5"
"#types/node": "^14.18.12",
This happens on basic custom components:
MyTst.tsx
import TimeAgo from "react-timeago";
const Mytst = () => {
return (
<div>
<TimeAgo date={"02/02/2022"} />
</div>
);
};
export default Mytst;
I get this error for react-custom-scrollbars-2 as well. There seems to be an issue with matching the types correctly between the library which contains the component and the #types files associated with them. Anyone have any ideas on how to resolve these type errors?
Had the same issue.
Just add this
"resolutions": {
"#types/react": "17.0.2",
"#types/react-dom": "17.0.2"
},
to package.json file and run yarn command.
UPD: Just a bit detailed answer:
#types/react-dom has its own dependencies and one of them is #types/react with a version set to '*' - a major release, that now, probably, refers to 18.
Even if you specify some strict versions in your package.json (without ^) parent package might install its own duplicates of packages that you are already using for its own purposes.
By using resolutions we are specifying strict restrictions for dependencies of dependencies.
You will need to fix the version for #types/react package because many react libraries have dependency set as #types/react : "*", which will take the latest version of the package. (I suppose they just released version 18)
To do that you can add this in your package.json
"resolutions": {
"#types/react": "^17.0.38"
}
It will just work fine with yarn, but if you are using npm, then you will also need to add this in "scripts" section of your package.json
"preinstall": "npm install --package-lock-only --ignore-scripts && npx npm-force-resolutions"
This will simply use npm-force-resolutions package to fix versions from resolutions.
And then after doing npm install, your app should work just fine.
I known issued today
rm -rf node_modules
rm -rf yarn.lock
npm install
just used npm install sovled problem
but I don't know what happend
Had this with Styled Components. Resolutions didn't work for me so here's another
solution:
Brute force type casting:
const ThemeProviderFixed = ThemeProvider as unknown as React.FC<PropsWithChildren<{ theme: string }>>;
Sahil's answer is correct for npm and yarn, but if you are using pnpm, you need a slightly different setup in your package.json file:
"pnpm": {
"overrides": {
"#types/react": "^17.0.38"
}
}
If you are using a monorepo with several packages, this only works at the root package.json file of your repo. You can read more about it here in the pnpm docs.
I also had the same issue, so I updated npm version ^6.0.0 -> 8.0.0 and it was resolved.
Check npm version.
I came across this issue recently when upgrading to React 18 and forgetting to upgrade my corresponding types in devDependencies.
What worked for me was upgrading React types to match in the package.json file as shown
{
...
"dependencies": {
...
"react": "^18.1.0",
},
"devDependencies": {
...
"#types/react": "^18.0.8",
}
}
I recently ran into this with a Yarn monorepo where a Typescript create-react-app subproject had installConfig.hoistingLimits=workspace. This configuration prevents hoisting of dependencies to the top-level of the monorepo.
When running react-scripts start, the type checker was still looking at the top-level #types and not finding the matching #types/react for the version of React configured on the project. The fix that resolved it was to add the following to the tsconfig.json in the subproject:
"compilerOptions": {
...
"typeRoots": ["./node_modules/#types"]
},
...
This points Typescript at the type definitions that are installed for the specific sub-project.
Ok. I ended up fixing this problem but to warn you in advance, there wasn't a magical way to do this.
I basically uninstalled all the #types I think were the offenders. You can find this out by reading your error window. The key was this message in my original error above.
Type 'React.ReactNode' is not assignable to type 'import("/home/user/app/node_modules/#types/react-bootstrap-table-next/node_modules/#types/react/index").ReactNode'.
If you see where the node module types are pointing to and its not associated with your library, then remove it. In my case, my issue was the package TimeAgo and the type error was showing that types were assigned to a different package. So I uninstalled it and kept cycling through the errors until it went away.
Then I use npm run build to do type checks and instruct me which types I had to reinstall. (There is probably a better way to do this part but it worked for me even though it was tedious.)
This issue seems to happen when you have a ton of different libraries and their types that have similar dependencies and overtime if they aren't needed, don't do what I do and just keep them piled up in your package.json.
So if you think any type can have conflicts with your library, uninstall and see if the error goes away, and then reinstall if other type errors appear that say the dev type package is missing. I also had some #type packages as dependencies instead of devDependencies which I removed and moved back into dev. Don't know if that played a part.
When in doubt, remove all applicable types and see if the issue is resolved.
If you have older version of npm, just update npm to version > 8.0.0.
It worked for me.
I had npm version 6.x.x. I tried many solutions, but update npm to new version fix this problem easy.
for npm!
check which version of node and npm you have installed.
if you update to 8.x, npm provides you the same thing as resolution does for yarn but its"overrides".
update your package like this:
"overrides": {
"#types/react": "17.x.x",
"#types/react-dom": "17.x.x"
}
my npm and node versions were up to date on local instance, but not on git ci. After the update, it was working without to override the versions for react and react-dom.
Unfortunately in my case I can't use the most voted answer since I need #types18 since I need to use the latest hooks from react#18 like useId and I can't import them using #types/react#17 since they have no exported members for those hooks.
I was able to use latest types fixing the broken typed deps, thanks to #Chris Web' s answer. For example for the Redux Provider:
// temp fix due to #types/react#18
const Provider = _Provider as unknown as React.FC<{
children?: JSX.Element | string;
store: any;
}>;
The store: any is not ideal, but it's just a temp fix.
You can solve this issue by following the above solution for react
"resolutions": {
"#types/react": "17.0.2",
"#types/react-dom": "17.0.2"
},
and for react-native you don't need to add type for react-dom
"resolutions": {
"#types/react": "17.0.2",
},
After this if you still getting error for react types,
add the type package separetly for react
npm install -D #types/react#17.0.2
Note - don't add "^" in resolution as it will try to install the latest version of packages which may cause the same problem.
Problem
For those who have this type of error in the APP and are using yarn instead of npm.
Solution
Just add the to resolutions and preinstall script inside the package.json file and them execute yarn preinstall and yarn.
package.json
"resolutions": {
.....
"#types/react": "^17.0.38"
....
},
"scripts": {
......
"preinstall": "yarn --package-lock-only --ignore-scripts"
......
},
References
Source
Slightly different answer that worked for me (in case the above doesn't work for you). I had a node_modules folder in my user root. So my project folder looked like this:
~/checkouts/project/node_modules
but I also had a node_modules folder installed at the user root (probably an accident at some point):
~/node_modules
The way npm packages work is it crawls up the directory structure grabbing npm packages along the way. After removing this directory the problem went away.
Tested this on two windows machines one mac and one ubuntu. One win machines was fine (no error on build), the other wind machine gave this error on build. Mac was also fine but ubuntu was also giving this error on build. I was frustrated. Tested with different node versions but that did not help.
In the end had to update some types versions (not sure though if all four needed to be updated but after the update error disappeared):
"#types/react": "^16.14.3",
"#types/react-dom": "^16.9.10",
"#types/react-router": "^5.1.11",
"#types/react-router-dom": "^5.1.7",
to:
"#types/react": "^18.0.15",
"#types/react-dom": "^18.0.6",
"#types/react-router": "^5.1.18",
"#types/react-router-dom": "^5.3.3",
i tried it in two ways, with yarn's resolution it solved it, but then i deleted my yarn.lock and updated the react's type and it worked for me too without using yarn's resolution
yarn upgrade #types/react#^18.0.21
I posted a different answer but it was basically a duplicate answer so I'll provide another approach.
If you're using yarn, you can run yarn dedupe and it will make the necessary changes to your yarn.lock file. It will consolidate any references to the same package to resolve to the correct version. As you can see from here, the - lines are what were removed and the + line is modified and saved:
-"#types/react#npm:*, #types/react#npm:>=15, #types/react#npm:>=16.9.0":
- version: 17.0.43
- resolution: "#types/react#npm:17.0.43"
- dependencies:
- "#types/prop-types": "*"
- "#types/scheduler": "*"
- csstype: ^3.0.2
- checksum: 981b0993f5b3ea9d3488b8cc883201e8ae47ba7732929f788f450a79fd72829e658080d5084e67caa008e58d989b0abc1d5f36ff0a1cda09315ea3a3c0c9dc11
- languageName: node
- linkType: hard
-
-"#types/react#npm:^18.0.0":
+"#types/react#npm:*, #types/react#npm:>=15, #types/react#npm:>=16.9.0, #types/react#npm:^18.0.0":
"#types/react#npm:*, #types/react#npm:>=15, #types/react#npm:>=16.9.0"
was consolidated into
"#types/react#npm:*, #types/react#npm:>=15, #types/react#npm:>=16.9.0, #types/react#npm:^18.0.0"
In my case, I put the wrong type of value inside a div.
Error
Reason
Fix

Getting error while adding React Testing Library for create-react-app (version 16.12.0)

I'm working on a react project in typescript (react version 16.12.0) and I would like to add React Testing Library to this. The newer versions of react comes with React-Testing-Library but the project I'm working on doesn't come with RTL, so I installed it manually.
I added the below to package.json and did yarn install
"#types/testing-library__react": "^10.2.0",
When I did yarn start, I get this error below
Other related packages versions used
"#types/react": "~16.9.14",
"typescript": "3.4.5",
"react-scripts": "^3.0.0",
The issue was occurring with the typescript version. After some research, I found that for react-testing-library to work with typescript, the TS version needs to be updated to 3.8 and above.
After updating typescript version to 3.8 and fixing some of the errors caused by this update, I was able to resolve this error.

update strategy for npm packages of expo

I wonder what the update strategy for expo is when using expo-cli.
F.e. my package currently consists of these packages:
"expo": "39.0.4",
"react": "16.13.1",
"react-dom": "16.13.1",
"react-native": "https://github.com/expo/react-native/archive/sdk-39.0.4.tar.gz",
"react-native-gesture-handler": "1.7.0",
"react-native-reanimated": "1.13.1",
"react-native-web": "0.14.8",
Normally when i do default react applications i just add renovate-bot to my repo and update everything all the time. Things seem to be different when using expo. Some questions:
When i updated react-native-gesture-handler or react-native-reanimated i got warnings when running expo start that these versions are out of range for my currently running expo package. Is it correct that i should not update those dependend packages until expo releases an update?
When i updated react to 17 no such warning popped up, so it seems expo is fine when i run newer version of react? (although i had other runtime warnings pop up related to it)
Why is react-native fixed to this specific version? I guess because expo expects an exact version? Is this when expo upgrade should be used once a new expo version gets released?
Thanks for answering any of these questions.

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